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偷懒的论文学习笔记(2)|DeepSeek 架构再进化!提出 mHC:给神经网络装上“流形稳定器”,彻底解决超连接训练不稳定性

  • 2026-01-11 12:41:17
偷懒的论文学习笔记(2)|DeepSeek 架构再进化!提出 mHC:给神经网络装上“流形稳定器”,彻底解决超连接训练不稳定性

DeepSeek 架构再进化!提出 mHC:给神经网络装上“流形稳定器”,彻底解决超连接训练不稳定性。

核心速览:

  • • 痛点:Hyper-Connections (HC) 虽然能通过拓宽残差流提升性能,但破坏了“恒等映射”性质,导致大规模训练信号爆炸、不稳定。
  • • 方案mHC (Manifold-Constrained Hyper-Connections)。通过将连接矩阵投影到“双随机矩阵”流形上,强制恢复信号守恒。
  • • 效果:在 27B 参数模型上验证,mHC 不仅完全修复了训练不稳定性,还在 MATH、GSM8K 等任务上全面超越基线,且额外训练开销仅为 6.7%。

    在 Transformer 统治大模型架构的当下,“残差连接”(Residual Connection)一直是模型深度的保障。最近, Hyper-Connections (HC) 的技术试图通过“把路修宽”(扩展残差流宽度)来提升模型性能,但却撞上了“训练不稳定”和“显存墙”两座大山。

    DeepSeek-AI 团队发布最新论文 《mHC: Manifold-Constrained Hyper-Connections》,提出了一种通用的架构框架 mHC。他们用巧妙的数学约束(流形投影)和极致的工程优化,成功驯服了 Hyper-Connections。

    01 HC 的困境:为了变强,牺牲了“稳”

    传统的残差连接公式是 ,其中的 (恒等映射)保证了信号能无损地传到深层,是训练深层网络的基石。

    Hyper-Connections (HC) 的思路是:将残差流  的维度扩大  倍(例如 4 倍),并引入可学习的矩阵  来混合这些流。

    问题出在哪里?随着层数叠加,多个  矩阵相乘。由于这些矩阵是无约束的,信号强度会发生剧烈波动,破坏了恒等映射的“守恒”机制。

    • • 数据说话:DeepSeek 在 27B 模型上的实验显示,HC 的前向信号增益(Amax Gain Magnitude)峰值竟然高达 3000!这意味着信号在传递过程中被疯狂放大,直接导致梯度爆炸和 Loss 激增。

    02 DeepSeek 的解法:把矩阵关进“流形”里

    DeepSeek 提出的 mHC(流形约束超连接),核心思想非常优雅:如果无约束的矩阵会导致信号失控,那我们就给它加个数学“紧箍咒”。

    1. 引入“双随机矩阵” (Doubly Stochastic Matrices)mHC 强制要求残差连接矩阵  必须投影到 Birkhoff 多胞形上。简单说,就是要求矩阵的每一行之和为 1,每一列之和也为 1

    2. Sinkhorn-Knopp 算法为了实现这个约束,DeepSeek 使用了 Sinkhorn-Knopp 算法进行迭代归一化。

    • • 几何解释:这使得残差映射变成了特征的“凸组合”(Convex Combination),而非简单的线性叠加。
    • • 数学性质:双随机矩阵相乘后依然是双随机矩阵。这意味着,无论网络堆叠多少层,信号的范数都受到严格控制,不会发生爆炸或消失。

    效果立竿见影:在 mHC 中,信号增益被完美控制在 1.6 左右,相比 HC 的 3000 降低了三个数量级,彻底恢复了训练稳定性。

    03 工程优化:打破“显存墙”

    理论很美好,但把残差流扩大  倍,意味着内存访问(I/O)成本也会暴涨。如果直接训练,速度会慢到无法接受。

    DeepSeek 在 mHC 中展示了其标志性的极致基础设施优化能力

    1. 1. 内核融合 (Kernel Fusion):利用 TileLang 开发定制内核,将 RMSNorm、矩阵乘法和 Sinkhorn-Knopp 迭代融合,大幅减少显存读写次数。
    2. 2. 选择性重计算 (Selective Recomputing):为了节省显存,前向传播丢弃中间激活值,反向传播时再重新计算。DeepSeek 推导出了最优的重计算块大小 ,精准平衡了计算与显存。
    3. 3. DualPipe 通信重叠:扩展了 DualPipe 调度策略,将 MLP 层放在高优先级计算流上,完美掩盖了 mHC 带来的额外通信延迟。

    最终结果:在  的扩展倍率下,mHC 的训练时间开销仅增加了 6.7%

    04 实验结果:全面超越

    DeepSeek 基于 DeepSeek-V3 的 MoE 架构,训练了 3B、9B 和 27B 参数量的模型进行验证。

    • • 稳定性:mHC 的 Loss 曲线和梯度范数(Gradient Norm)与标准基线模型几乎一致,完全消除了 HC 的尖峰抖动。
    • • 下游任务:在 GSM8K (数学)、DROP (阅读理解)、BBH (推理) 等 benchmark 上,mHC 全面超越了标准 Baseline 和原始 HC。
      • • GSM8K (8-shot): Baseline 78.5 -> mHC 80.5
      • • DROP (F1): Baseline 47.0 -> mHC 53.9
      • • BBH (3-shot): Baseline 43.8 -> mHC 51.0

    结语

    DeepSeek 的这项工作再次证明,大模型架构的创新不仅仅是“堆参数”或“改算子”,更在于对底层数学性质(如信号守恒)的深刻理解系统级工程优化的结合。

    mHC 为未来的大模型设计指明了一个新方向:通过拓扑结构的流形约束,我们完全可以在保持训练稳定的前提下,进一步释放神经网络的表达能力。


    参考资料:

    • • Xie et al. mHC: Manifold-Constrained Hyper-Connections. DeepSeek-AI, 2025.

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    1. CONNECT:[ UseTime:0.000828s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001419s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.014659s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.012426s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001319s ]
    6. SELECT * FROM `set` [ RunTime:0.015859s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001620s ]
    8. SELECT * FROM `article` WHERE `id` = 459201 LIMIT 1 [ RunTime:0.025149s ]
    9. UPDATE `article` SET `lasttime` = 1768118885 WHERE `id` = 459201 [ RunTime:0.019648s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000487s ]
    11. SELECT * FROM `article` WHERE `id` < 459201 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000787s ]
    12. SELECT * FROM `article` WHERE `id` > 459201 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000635s ]
    13. SELECT * FROM `article` WHERE `id` < 459201 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004630s ]
    14. SELECT * FROM `article` WHERE `id` < 459201 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001083s ]
    15. SELECT * FROM `article` WHERE `id` < 459201 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002571s ]
    0.180201s